When mixing filles in the Multitrack window, the output monitoring introduces peak level clicks at regular intervals (i.e. all the time) whenever two or more files are imported. The clicks are only on monitoring output and do not appear on any waveform metering or subsequent mixdown.
The majority of files I work with are 48KHz. The Audio Hardware I/O Buffer Size has been increased to 1024 but with no difference. On the Mac side, the Audio Device is on Built-in Output, with both channels being 48KHz, 16-bit.
Working with Macbook Pro (2.93 GHz with 4Gb ram) using 10.6.4 operating system
What does the status bar read when you're playing (Status bar is the bottom-most row in the main Audition window)